During a Thursday appearance on The Tonight Show with Jay LenoGrey’s Anatomy alumKatherine Heigl opened up about the “beautifully serendipitous” adoption of daughter Adelaide.

“This was fascinating because we started the adoption process again and we thought we were going to adopt internationally. It’s a pretty long process. It can take years,” she said her initial plans to find a sibling for Naleigh, 4, with husband Josh Kelley.

While the couple adopted Naleigh from Korea, they opened up their search this time around.

“And then we started exploring because we had heard that Korea had gotten very hard to adopt from, and China had a very, very long waiting list and I was like (taps wrist), any day now,” she continued

As it turns out, they found a match within the U.S. this time around.

“And so we started exploring the idea of domestic adoption – just exploring – and then my lawyer called and said, ‘There’s a birth mother and she’s due in four weeks and she’s all yours if you want her,’” the Knocked Up star said.

Katherine said the immediacy of their adoption news came as a surprise to her musician husband.

“He thought it was going to be a few years, and that we were going to end up with more of like a 9-month-old or 10-month-old, and he looked at me and said, ‘You’re telling me in a month we’re going to have a newborn?’ And I said, ‘Yes. It’s perfect timing, don’t you think? Look we’re both here, we’re not working. This is great. We can spend time with her,’” she shared.

The proud mom added: “And it has been beautifully serendipitous and graceful, because we’ve gotten to spend all this wonderful time with her.”